Comment 9 for bug 593944

In this plan should:
1) Exist some shortcut (key that pressed and drawing a track) that highlight the not direct connection (that connections that can be made in the case of swap the parts/pins);
2) Other easy way to change it on the fly (when we are drawing the track, shifting between the options);
3) Take in account the pins already connected to tracks (show just the pins without tracks in step 2?);
4) Do the bi-directional annotation at the end;